DOVER, N.H. — A longtime Liberty Mutual employee with eight home-schooled children was indicted on 52 charges of child pornography possession at Strafford County Superior Court this month.

David Polley, 53, of Sanford, Maine, allegedly had 3,093 child pornographic images and 1,185 movie files on eight thumb drives, two Zip disks and 33 CD/DVDs. Polley had the images at work, where he had served as a systems analyst designer for 29 years.

Dover police were told child sex abuse images were on a computer Polley was in possession of as soon as they were discovered. Detectives started an investigation on June 14 of last year.

On July 2, officers from the Sanford Police Department arrested Polley at his residence on a fugitive from justice charge. The following day, Polley waived extradition. He was brought to the Strafford County House of Corrections on July 9, where he was arrested without incident on a warrant.

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Of the images, 502 involved children who could be identified by the National Center for Missing and Exploited Children. An additional 2,000 images involved unknown children.

No local children were identified in the pornographic images, which included images of young girls and boys being abused, according to police officials.

A dog was used in at least one of the videos.

Paperwork filed by Polley’s attorney, Stephen C. Brown of Rochester, said Polley has no criminal history.

An assessment report indicates Polley has no mental illness or history of substance abuse.

Polley’s wife of 28 years and his children, who range in age from 8 to 26, were shocked by the accusations, Brown said.

Polley was released on $5,000 cash or corporate surety bail Aug. 2. He was accepted into Strafford County Community Corrections Bail Supervision Program.

Bail conditions include no use of the Internet, except to seek employment. Polley is to reside at his home in Sanford.

The Polley family has no Internet access and does not own a home computer, according to court records.

Each charge against Polley is a Class A felony. He could serve up to 15 years at New Hampshire State Prison for each charge.